Messages in this thread | | | Date | Sat, 08 Mar 2014 07:59:08 -0800 | From | Guenter Roeck <> | Subject | Re: [lm-sensors] 3.13.?: Strange / dangerous fan policy... |
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On 03/08/2014 03:08 AM, Jean Delvare wrote: > On Fri, 7 Mar 2014 14:52:30 -0800, Guenter Roeck wrote: >> On Fri, Mar 07, 2014 at 11:04:29PM +0100, Manuel Krause wrote: >>> Hi, and thanks for the quick response! >>> No special fancy "fan control policy". 'fancontrol' isn't up or >>> running. >>> Vanilla kernels 3.11.* and 3.12.* had been working on here without >>> any extra work. >>> -- >>> # sensors >>> acpitz-virtual-0 >>> Adapter: Virtual device >>> temp1: +71.0°C (crit = +256.0°C) >>> temp2: +69.0°C (crit = +110.0°C) >>> temp3: +52.0°C (crit = +105.0°C) >>> temp4: +25.0°C (crit = +110.0°C) >>> temp5: +58.0°C (crit = +110.0°C) >>> >>> coretemp-isa-0000 >>> Adapter: ISA adapter >>> Core 0: +62.0°C (high = +105.0°C, crit = +105.0°C) >>> Core 1: +60.0°C (high = +105.0°C, crit = +105.0°C) >>> -- >>> My notebook (HP/Compaq 6730b) does not have a seperate fan sensor. >>> This is with 3.12.13 with my normal workload. >>> >>> Please, trust my above mentionned values of 94 °C vs. 74°C as I >>> don't like to boot 3.13.6 anymore, to avoid harm to the notebook's >>> casing. >> >> Understood. Unfortunately, we'll need to get information >> from the new kernel to be able to track down the problem. > > Indeed. Not only the run-time temperatures, but also the high and crit > limits. > >>> But I'd do to test any improvement-patch. >> >> So far I have no idea what is going on. I don't see anything in the >> drivers providing above data that would explain the behavior, >> but I might be missing something. > > Looks like a regression in the acpi subsystem or in power management, > not hwmon. Hwmon is merely reporting the temperatures, it's not > responsible for the actual temperatures. >
I would agree. I don't think we have enough information to be sure, though. There might be some unintended interaction or interference.
gpu is a good hint ... for example, look at commit b9ed919f1c8 (drm/nouveau/drm/pm: remove everything except the hwmon interfaces to THERM). nouveau does export pwm and fan control information, so any change in that code may have unintended side effects. Similar, I don't know how ec39f64bba (drm/radeon/dpm: Convert to use devm_hwmon_register_with_groups) could have the observed impact, as it is purely passive, but I prefer to be rather safe than sorry.
This problem has now been submitted into bugzilla as https://bugzilla.kernel.org/show_bug.cgi?id=71711.
Guenter
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